Opt Lett. 2015 Aug 1;40(15):3639-42. doi: 10.1364/OL.40.003639.
Non-polar-oriented ZnO/Zn0.81Mg0.19O multiple quantum wells (MQWs) were grown on r-plane sapphire substrates by plasma-assisted molecular beam epitaxy. The internal quantum efficiency (η(int)) of the non-polar MQWs was only 1.8%. The degraded quality of non-polar MQWs is the main factor for the low η(int). Besides improving the quality of non-polar MQWs, an effective way to enhance the UV emission of the non-polar MQWs by sputtering Pt nanoparticles has been used. Employing the resonant coupling between UV emission from the MQWs and Pt nanoparticle surface plasmons (SPs), a 20-fold enhancement of the UV emission has been achieved under the optimized sputtering time. Moreover, the η(int) value of the non-polar MQWs has been strongly improved with the help of Pt. 6.7-fold enhancement of η(int) has been achieved due to SPs coupling. It paves a new way in designing highly efficient non-polar LEDs.
非极性取向的 ZnO/Zn0.81Mg0.19O 多量子阱（MQWs）通过等离子体辅助分子束外延生长在 r 面蓝宝石衬底上。非极性 MQWs 的内量子效率（η(int)）仅为 1.8%。非极性 MQWs 质量下降是 η(int) 低的主要因素。除了改善非极性 MQWs 的质量外，还通过溅射 Pt 纳米粒子来增强非极性 MQWs 的紫外发射，这是一种有效的方法。在优化的溅射时间下，利用 MQWs 的紫外发射与 Pt 纳米颗粒表面等离激元（SPs）之间的共振耦合，实现了紫外发射的 20 倍增强。此外，Pt 的介入极大地提高了非极性 MQWs 的 η(int) 值。由于 SPs 耦合，η(int) 值提高了 6.7 倍。这为设计高效的非极性 LED 开辟了一条新途径。
